Grinding machine work head



M r h .1944. c. G. FLYGARE ET AL 2,344,243

GRINDING MACHINE WORK-HEAD s Sheets-Sheet 1 Filed April 8, 1942 Q, 3mm. CARL G.

FLYGARE HERBERT A.

' 5/1 vEN ymlmwh March 1944- c. G. FLYGARE ETAL I 4 GRINDING MACHINE WORK-BEAN Filed April 8, 1942 5 Sheets-Sheet 2 awe/I'M CARL G-FLYGARE HERBERT A. s/LVEN H115 M -a mv March 14, 1944.

c. s. FLYGARE ETAL GRINDING MACHINE WORK-HEAD Filed April 8, 1942 5 Sheets-Sheet 3 Ema/whom EARL G.

FL. YG'AR'E HERBERT A.

SILVEN vafimuueazm M March 14, 1944. c, FLYGARE ETAL 2,344,243

GRINDING MACHINE WORK-HEAD 5 Sheets-Sheet 4 Filed April 8, 1942 EN Mi 4% E 2. 1 A F GT B m H Patented Mar. 14, 1944 2,344,243 GRINDING MACHINE wom: HEAD Carl G. Flygare and Herbert A. Silven, Worcester,

Mass., asslgnors to Norton Company, Worcester, Mass, a corporation of Massachusetts Application April 8, 1942, Serial No. 438,092

11 Claims.

The invention relates to grinding machines, and more particularly to a work head for chucking an irregularly shaped work piece.

One object of the invention is to provide a simple and thoroughly practical work head fora grinding machine for rotatably supporting a relatively long, irregularly shaped work piece for a grinding operation. Another object of the'invention is to provide a work head having a hollow spindle 'which supports a pair of spaced, relatlvelyadjustable work supporting and centering chucks. I

Another object of the invention is to provide a work head having a fixed chuck at one end and a longitudinally adjustable chuck spaced therefrom which are arranged to support and center an irregularly shaped work piece. A further object of the invention is to provide a work spindle having two spaced longitudinally adjustable work supporting chucks, one of which is adjustable rotarily and angularly relative to the other to support an irregularly shaped work piece for a grinding operatiom Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements,

and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and

the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which is shown one of various possible embodiments of the mechanical features of this invention,

Fig. 1 is a front elevation of a grinding machine work head; I

Fig. 2 is a right-hand end elevation of the work head, on an'enlarged scale, taken approximately on the line 2--2 of Fig. 1, shdwing the work piece in cross section;

Fig. 3 is a vertical sectional view, taken approximately on the'line 3-3 of Figs. 2 and 4;

Fig. 4 is a cross-sectional view, taken approximately on the lined-4 of Figssl and 3;

Fig.5 is a fragmentary cross-sectional view, on an enlargedscale, taken approximately on the line 5- 5. of Fig. 2, through one of the work chuck jaw slides; I J

Fig. 6 is a fragmentary cross-sectional view, on an enlarged scale,- taken approximately on the lin'e66 of Fig. 4, through one of the chuck jaw slides; v

Fig. .7 is a cross-sectional view, taken' approximately on the line 7-1 of Fig. 4;

Fig. 8 is a cross-sectional view, taken approximately on the line 8-8 of Fig. 4;

Fig. 9 is a cross-sectional view,-taken approximately on the line 9-9 of Fig. 2;

Fig. 10 is a cross-sectional view, taken approximately on the line |0--l0 of Fig. 2;

Fig. 11 is a fragmentary cross-sectional view, on an enlarged scale, taken approximately on the line Hll of Fig. 2; and

10 Fig. 12 is a fragmentary cross-sectional view,

on a reduced scale, taken approximately on the line l2-l2 of Figs. 1 and 3, through one of the work spindle bearings.

An improved work head for a grinding ma- 15 chine has been illustrated in the drawings. A

work table serves as a support for a pair of spaced frames 2] and 2-2 which serve rotatably to support a hollow rotatable work supporting and centering spindle 23 for supporting a rela- 20 tively long, irregularly shaped work piece, such as an aeroplane propeller blade 24, during a grinding operation in which external cylindrical hub surfaces 25 and 2G and an internal surface 21 are successively ground by means of grinding 25 wheels '28 and 29, respectively.

The. frames 2| and 22 are provided with bearings for rotatably supporting the work spindle 23. These bearings are substantially identical, consequently only one has been illustrated in detailjin Fig. 12. These bearings comprise a pair of lower partial bearing members 30 and 3| which are spaced from each other on the frames'2l and 22, respectively, and an upper adjustable bearing member or shoe 32 which is held in adjusted position by means of spaced adjusting screws 33 and 34.

A motor driven mechanism is IJ T'VidBd for driving the spindle 23 during a grinding opera-- .tion, comprising an electric motor 35 which is supported on a transversely adjustable platen 36.

The platen 36 is in turn slidably supported on a pivotally mounted plate 31 which is pivoted on a rock shaft 38. The rock shaft 38 isin turn supported by a bracket 39 formed integral with the frames 2| and 22, respectively. An adjusting screw 43 is provided which is screw threaded through the plate 31 and abuts against a sur face 4| formed on a bracket 42 formed integral with the frame 2|, by means of which the motor support 31 maybe rocked to tension the work spindle driving belts. No electric controls for'the motor 35 are shown since such motor-controls and thewiring arrangement'frequiredffare well known. The motor 35 is provided witha' multi- 5 v-groove pulley l3 whichis connected by Inulwork piece therein. that it may be rotarily adjustable relative to the links 82, 83, 84 and 85 by: the chuck plate 'multaneously to actuate the jaws of the chuck tiple V-belts 44 with a multiple 45 which is mounted on one end of a rotatable jack shaft 46. The jack shaft 46 is journalled in suitable bearin s in mounted on the rear of the plate 31. A multi- V-gr'oove pulley 49 is mounted on the other end of the jack shaft 48 and is connected by multiple V-belts 50 with a pulley mounted on the lefthand end of the hollow work spindle 28 (Figs. 1 and 3).

The improved work head is particularly adapted to chuck relatively long, pieces such as, for example, aeroplane propeller blades which may be several 'feet in length. In supporting a long work piece such as a propeller blade 24, it is desirable to provide. more than one point of support in order that the blade may be accurately aligned, centered and positioned for a grinding operation. A multiple jaw chuck 80 is supported on the right-hand end of the work spindle 23 (Figs. 1 and 3) for supporting the hub end of the blade 24. This chuck is supplemented by a second multiple jaw chuck 6| which is spaced from the chuck 60 and is adjustable longitudinally relative to the spindle 23.

The chuck 80 is a multiple jaw chuck in which the jaws are independently adjustable and also may be simultaneously actuated for clamping a The chuck'80 is arranged so work spindle 23 and is also mounted so that it may be adjusted laterally, that is, in a plane normal to the axis of the work spindle 23 in two directions. The chuck 60- comprises a plurality of work engaging jaws 65, 88,81 and 68 formed integral with dovetailed slides and 12.

V-groove pulley the brackets 41 and 48 irregularly shaped work which are .35

The dovetailed slides are in turn supported in dovetailed slides 13, 14, 15 and 18 which mate with correspondingly shaped ways attached to a chuck plate 11 (Fig. 5). Adjusting screws 18,

19, 80 and 8| are connected between the dove-- tailed slides 89, 10, 11 and 12 and the dovetailed slides 18, 14, 15 and 18, respectively (Figs, 2 and 3), by means of which the chuck jaws 8,5, 88, 81 and 88 may be independently adjustable relative to the dovetailed slides 18, 14,-18 and 18, re-

spectively.

A mechanism. is provided for simultaneously moving the slides 13, 14, 15 and 18 to and from an operating position, comprising a plurality of each of which is provided with circular shaped ends which mate with correspondingly shaped sockets fdrm'ed in the outer ends of the dovetailed slides 13,, 14, 18 and 18. The other ends of the links 82, 88, 84' and 88 mate with correspondingly shaped sockets formed in an annular ring 86. The annular ring" 88 is rotatably supported by means of a plurality of needle bearings 81, 88, 89 and 80 (Figs. 2, 9 and 11). The chuck jaws 88, 88, 81 and 88 have been illustrated in engagement with a work piece 24 fora grinding operation.

When it is desired to release the chuck jaws to 83, 84 and 88 also in a counterclockwise direction to withdraw the slides 12, 14,

release the Work piece 24. A ternal surface of the-ring 88 is provided with an internal gear segment 8i which meshes with a pinion 82.- The pinion 02 is rotatably supported at one end by a, bracket 88 and at the other end 11. when it is desired siand is positioned between 95 relative to the plate a wrench is applied to a square-shaped aperture 04 formed within the pinion 92 to rotate the same to turn the ring 88 within its supporting bearings so as to simultaneously actuate the work clamping jaws 88, 88, 81 and 88.

In order to facilitate a lateral adjustment in two directions, the chuck plate 11 is supported on a plate 85. IA pivot stud 98 is fastened to the plate 11- by means of a screw 81. The pivot stud 08 fits within a correspondingly shaped circular aperture 88 formed in the plate 98. A screw adjusting mechanism is provided at a point substantially diametrically opposite the pivot stud 98, comprising a stud which is fastened tothe plate 98. An adjusting screw I00 is screw .threaded through'the stud 99. The plate 11 is provided with a cut-out portion IOI (Fig. 2) and and I03 which form a pair Ofl projecting lugs I04 and I08 which serve as supports for a pair of thrust screws I08 and I01. The thrust screws I08 and I01 are adjusted to bear against the ends of the adjusting screw I00 to form end thrust members therefor. It will be readily apparent from the foregoing disclosure that adjustment of the screw I00 will be transmitted through the thrust screws I00 and I01 to impart a lateral adjustment to the plate 11 which pivots about the stud 98. This lateral adjustment of the plate 11 isin a direction normal to the axis of the work head spindle 28 and facilitates a cut-out portions I02 transverse or lateral adjustment of the work piece when desired.

A second lateral adjustment of the plate 11 is provided so that the chuck assembly may be adjusted laterally in two directions if desired. The plate 95 is supportedfora pivotal lateral adjustment on a plate IIII. A pivot stud III is f astened to the plate 85 by a screw I I2. The pivot stud I I I fits within a circular aperture I I3 formed in the plate IIO. A. stud H4 is fixedly supported in the plate III. wTheplate 85 is provided with cut-out portions, forming a pair of lugs H8 and H8 which serve as supports for a pair of aligned end thrust screws "1 and H8. An adjusting screw II! is screw threaded through the stud I I4 the end thrust screws H1 and H8. The thrust screws 1 and H8 are adjusted so that their ends bear against the adjusting screw H8. It will be readily apparent from the foregoing the screw I I! will be imparted to swivel the plate II8 about the axis of the pivot stud III to impart a lateral adjustment to the chuck 80.

In order to facilitate regularly-shaped work piece, blades having diiferent pitches, it is desirable to provide a rotary adjustment for the chuck 88 so that the entire chuck assembly'may be rotatadjusted relative to the chuck 8| when dethe chucking of an irsuch as propeller sired. The work spindle 28 is provided with an 18 and 18 so as to portion of the in- III. An annular flanged member integral flange I28 having a plane face I2I which is positioned against a plane face on the plate I22 is held in position on the plate I II by a plurality of clamping screws I28 by means of which the plate III tose r with the chuck parts supported thereby may be cla ed in rigid adjusted position relative to the flange I28 and the work head spindle 28. The periphery of the plate III is provided with graduation: (not shown) and an index pointer I28 (Fig. 3) in order to facilitate rotary or angular adjustment of the chuck 88. By meansof the graduation: and the index pointer I28, the chuck' "may be rotated the desired disclosure that adjustment of lateral adjustment of the plate I42 in two directions, that is, in two directions normal to the number of degrees, after which it may be clamped inadjusted position by tightening the clamping screws I23.

The chuck 6| for supporting the work piece, or propeller blade 24 at a distance spaced from the hub is arranged so that it may be adjusted longitudinally relative to the spindle 23 and also so that the chuck jaws may be independently adjusted or simultaneously moved as well as a double lateral adjustment of the chuck assembly to facilitate positioning the work piece as desired. A slidably mounted sleeve I surrounds the work spindle 23. The sleeve I30 is provided with a saw cut I3I forming two bosses I32 and I33 through which a clamping screw I34 passes. The clamping screw I34 passes through a'clearance hole in the boss I32 (Fig. 4) and is screw threaded into the boss I33. The sleevev I30 may be readily clamped in adjusted position on the spindle 23 by clamping the clamping screw I34; The sleeve I30 is provided with a radially extending integral flange I35 which serves as a support for the chuck 6| The chuck 6| is provided with a pair of independent y adjustable work engaging jaws I36 and I 31 which are formed integral with dovetailed slides I38 and I36. The dovetailed'slides I36 and I39 are in turn supported by dovetailed sl des I40 and MI, and the slides I40 and MI are supported by a chuck plate I42. A pair of adjusting screws I43 and I44 are provided which are interposed between the dovetailed slides I38-I40 and I33I4I, respeqively;

to facilitate independ nt adjustment of the chuck jaws I36 and I31.

It is desirable to provide means for simultaneously moving the chuck jaws I36 and I31 to and from an operative posit on. A pair of links I45 and I46 are provided, having circular shaped ends which mate with correspondingly shaped sockets on the outer ends of the slides I40 and MI, respectively. The outer ends of the links I45 and I46 mate with correspondingly shaped a ertures formed in a rotatable annular ring I41. The ring I41 is rotatably supported within the chuck by a plurality of needle bearings I48, I49, I50 and,

I5! (Fi s. 4 and 7). A rack and'gear mechanism is provided for adjusting the position of the ring I 41, comprising an internal gear segment I52 which meshes with a rotatable p nion I53 carried by a bracket I54. A square aperture I55 is provided within the pinion I53. When it is desired to clamp or release a work piece 24 from the chuck GI, a wrench is applied to the aperture I55 to rotate the pinion I53 which in turn transmits a corresponding motion to the internal gear teeth I52 so as to rotate the ring I41 as desired.

The jaws I36 and 131 are shown in an operative position. When it is desired to release the work piece 24 from the chuck H, the pinion I53 is rotated in a counterclockwise direction to impart a correspond ng counterclockwise adjustment to the ring I41 which swings the links I45 and I46 in the same direction to withdraw the slides I 40 and I to remove the work jaws I36 and I31 from engagement with the work piece 24. Similarly', when it is desired to chuck a work piece 24, the pinion I53 together with the ring I41 are moved in a clockwise direction which causes the jaws I36 and I 31 to move toward the axis of rotation of the work spindle 23 to clamp a work piece 24 in operative position thereon.

The parts of the chuck 6I-above described are supported on the plate I 42 which is in turn supported on a plate I53. In order to provide a axis of rotation of the work spindle 23, the plate I42 serves as a support for a pivot stud I which is fastened thereto by means of a screw I6I. The pivot stud I60 fits within 9, correspondingly shaped aperture .in the plate I59. An adjusting device is provided at a. point substantially diameterically opposite the pivot stud I60, comprising a stud I62 which is fastened to the plate I 59. The stud I62 supports an adjusting screw I63. The plate I42 is provided with cutout portions forming a pair .of projectingv lugs I64 and I65 which serve as supports for a pair of end thrust screws I66 and I61, respectively. The end thrust screws I66 and I61 are adjusted so that their inner ends bear against the ends of the adjusting screw I63 to take up any lost motion therebetween. It .will be readily apparent from theforegoing disclosure that when the screw I63 is rotated a lateral adjustment of the plate I42 together with the jaws I36 and I31 is eflected in a direction normal to the axis of rotation of the work spindle 23 about the pivot stud I60 as an axis.

of the chuck 6|, the plate I59 is pivotally supported on the flange I35 by means of a pivot stud I10 which is fastened to the plate I59 by means of a screw "I. The pivot stud I10 fits within a correspondingly shaped aperture formed in the flange I35. The plate I59 is provided. with cut-out portions, forming two projecting lugs I13 and I14 which serve as supports for end thrust screws I15 and I16. A stud I11 (Figs. 4 and 7) is fastened to the flange I 35 and serves as a support for an adjusting screw I18.

The ends of the adjusting screw I18 abut against the inner ends of the end thrust screws I15 and I16 so that any rotary adjustment of the screw I18 will be imparted to move the plate I59 about the pivot stud I10, as an axis. laterallyto adjust the chuck parts including the work engaging jaws I 36 and I31 in a lateral direction,- that is, normal to the axis of rotation of the work spindle 23 and in a direction substantially at right angles to the adjustment previously described.

It will be readily apparent from the foregoing d sclosure that the jaws I36 and I31 of the chuck 6| may be independently adjustable or simultaneouslymoved to and from an oprative position, and the chuck together with the jaws I 36 and I31 may be adjusted laterally in two directions so as to position the axis of the work piece 24. I I

The work spindle 23 is provided with elongated slots I and I8I through which the slides I40 and I4! together with the work engaging jaws I36 and I31 may pass. These elongated slots I80 and .I8I fac litate a substantial lengthwise adjustment of the chuck BI so as to facilitate positioning it in the desired relationship with the chuck 60 to form the proper support for a relat velv long propeller blade 24.

The operation of this improved work head will be readily apparent from the foregoing disclosure. Assuming all of the parts to have been previously adjusted. a propeller blade 24 is slid within the aperture of the hollow spindle 23 in the desired longitudinal position and the blade 24 is aligned with the jaws I36 and I31, after which the operator may apply wrenches to turn the plnlons 92 and I53 to move the chuck jaws I36 and I31 and 65, 66, 61 and 68 into operative clamping position to support and center the pro- In order to provide a similar lateral adjustment peller blade within the work spindle 23. In order to alignthe particular work piece with respect toits axis of balance, the chucks 60 and SI may be laterally adjusted as desired after the chuck jaws have been clamped in adjusted position. While the work piece 24 is thus supported by the chucks 60 and GI, the work spindle 23 may be rotated and the desired grinding operation performed on the external surfaces 25 and 26 and the internal surface 21 by the grinding wheels 28 and 29. I

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

' We claim:

1. In a grinding machine having a rotatable work support including a hollow rotatable work spindle, a multi-jaw chuck adjustably mounted on one end of said spindle, a second multi-jaw chuck slidably mounted on said spindle which is spaced from the first chuck, and means rotarily to adjust said first: chuck relative tosaid spindle.

2. In a grinding machine having a'rotatable work support including'a hollow rotatable work spindle, a multi-jaw chuck adjustably mounted on one end of said spindle,a second multi-jaw chuck slidably mounted on sad spindle which is spaced from the first chuck, means to adjust. said second chuck longitudinally relative to said spindle, and means rotarily to adjust said first chuck relative to said spindle.

3. In a grinding machine having a rotatable work support including a hollow rotatable work spindle, a multi-jaw chuck adjustably mounted on one end adjust said uck relative to said spindle, and means bodily to adjust said chuck relative to said spindle in a plane normal to the axis of the work spindle.

4. In a grinding machine having a rotatable work support including a hollow rotatable work spindle, a multi-jaw chuck adjustably mounted on one end 9. said spindle, means rotarily to adjust said c' uck relative to said spindle, and means bodily to adjust said chuck relative to the axis of said spindle in one direction in a plane normal to the axis of said work spindle.

5. In a grinding machine having a rotatable work support including a hollow rotatable work spindle, a multi-jaw chuck adjustably mounted on one end of said spindle, means rotarily to adjust said chuck relative to said spindle, and means bodily to adjust said chuck relative to the axis of said spindle in two directions at substantially right angles in a plane normal to the axis of said work spindle.

6. In a grinding machine having a rotatable work support including a hollow rotatable work spindle, a multi-jaw chuck adjustably mounted on one end of said spindle, a second multi-jaw chuck on said spindle which is spaced from the first chuck, and independent means bodily to adjust both of said chucks relative to the axis of said spindle in one direction in a plane normalto the axis of the work spindle.

7. In a grinding machine having a rotatable work support including a hollow rotatable work spindle, a multi-jaw chuck adjustably mounted on one end of said spindle, a second multi-jaw chuck on said spindle which is spaced from the first chuck, and independent means bodily to adjust both of said chucks in two directions at substantially right angles in a plane normal to the axis of said work spindle.

8. In a grinding machine having a rotatable work support including a hollow rotatable work spindle, a multi-jaw chuck adjustably mounted on one end of said spindle, a second multi-jaw chuck adjustably supported on said spindle which is spaced from the first chuck, means to adjust said second chuck longitudinally on said spindle, means rotarily to adjust said first chuck relative to said spindle, and independent means bodily to adjust both of said chucks in a plane normal to the axis of said work spindle.

9. In a grinding machine having a rotatable work support including a hollow rotatable work spindle, an integral flange formed on one end of said spindle, a multi-jaw chuck adjustably mounted on said flange, a second multi-jaw chuck on said spindle which is spaced from the first chuck, means to adjust said second chuck longitudinally on said spindlefmeans rotarily to f said spindle, means rotarily to tending clearance slots adjust said firstchuck relative to said. flange and spindle, and independent means bodily to adjust both of said chucks independently in two directions at substantially right angles to each other in a plane normal to the axis of said work spindle. 1

10. In a grinding machine having a rotatable work support including a hollow rotatable work spindle having a plurality of longitudinally extherein, a multi-jaw chuck adjustably mounted on one end of said spindle, a second. multi-jaw chuck including a chuck body having a plurality of radially adjustable jaws, said chuck being slidably supported on said spindle and spaced from the first chuck and having its jaws extending through the clearance slots in said spindle, and means bodily to adjust said second chuck transversely and longitudinally relative to the axis of said spindle.

11. In a grinding machine having a rotatable work support including a hollow rotatable work spindle having longitudinally extending clearance slots therein, a multi-jaw chuck adjustably mounted on one end of said spindle, a second multi-jaw chuck on said spindle which is spaced from the first chuck having its jaws extending through the clearance slots in said spindle, means to adjust said second chuck longitudinally on said spindle, and independent means bodily to adjust both of said chucks relative to said spindle in a plane normal to the axis of said work spindle.

CARL G. FLYGARE.

HERBERT "A. SILVEN. 

